981405 has 24 divisors (see below), whose sum is σ = 1725048. Its totient is φ = 516096.

The previous prime is 981397. The next prime is 981419. The reversal of 981405 is 504189.

It can be written as a sum of positive squares in 4 ways, for example, as 19044 + 962361 = 138^2 + 981^2 .

It is not a de Polignac number, because 981405 - 2³ = 981397 is a prime.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 981405.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4989 + ... + 5181.

It is an arithmetic number, because the mean of its divisors is an integer number (71877).

2⁹⁸¹⁴⁰⁵ is an apocalyptic number.

It is an amenable number.

981405 is a deficient number, since it is larger than the sum of its proper divisors (743643).

981405 is a wasteful number, since it uses less digits than its factorization.

981405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317 (or 314 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 981405 is about 990.6588716607. The cubic root of 981405 is about 99.3762845449.

The spelling of 981405 in words is "nine hundred eighty-one thousand, four hundred five".